Controller for internal combustion engine
AssigneesNippon Soken, Inc., Denso Corporation
InventorsMasahiro Shigenaga, Kimitaka Saitoh, Masatoshi Basaki, Makoto Miwa
Life of this patent
Estimating the term…
Abstract
An ON-ignition signal is outputted from an ignition control portion in a period from a posterior time point of the power stroke to an valve opening timing of an exhaust valve so that a capacitor is charged. Then, when it is determined that the maximum value of an ion-output value detected during a negative valve overlap period becomes greater than or equal to a threshold, it is determined that the applied voltage between an center electrode and a ground electrode of a spark plug is dropped. The ON-ignition signal is outputted again to charge the capacitor before the intake valve is opened.
Claims6
A controller for an internal combustion engine, comprising:
- a first fuel supplying means for supplying a fuel into a combustion chamber of the internal combustion engine in an NVO period during which an exhaust valve and an intake valve are closed, the NVO period being established from a posterior time point of an exhaust stroke until an anterior time point of an intake stroke of the internal combustion engine;
- a second fuel supplying means for supplying a fuel into the combustion chamber in the intake stroke after a fuel supply by the first fuel supplying means;
- an ion-current obtaining means for obtaining an information about an ion-current which flows between a center electrode and a ground electrode of a spark plug in a period during which an electric voltage is applied between the center electrode and the ground electrode by an electric storage which stores a part of electric power supplied to the spark plug;
- a detector detecting a combustion condition of the supplied fuel based on the information about the ion-current obtained by the ion-current obtaining means;
- a first electric power supply means for supplying an electric power to the spark plug in order to charge the electric storage in a period from a posterior time point of the power stroke until the fuel is supplied by the first fuel supplying means;
- and
- a second electric power supply means for supplying an electric power to the spark plug again in order to charge the electric storage before the fuel is supplied by the second fuel supplying means when the electric power stored in the electric storage becomes lower than a specified value during the NVO period.
Dependencies are inferred from the claim text.